Blade-sharpener



(No Model.)

W. 11. REYNOLDS BLADE SHARPENER.

No. 453,661. Patented June 9,1891.

UNITED STATES PATENT OFFICE.

VIIILIABI II. REYNOLDS, OF DANVERS, MASSACHUSETTS.

BLADE-SHARPENER.

'SPECIFICATION forming part of Letters Patent No. 453,661, dated June 9,1891.

Application filed January 27, 1891. Serial No. 379,239. (No model.)

To @ZZ whom it may concern:

Beit known that I, WILLIAM H. REYNOLDS, of Danvers, county of Essex,State of Massachusetts, have invented an Improvement inBlade-Sharpeners, of which the following description, in connection withthe accompanying drawings, is a specification, like letters and gures onthe drawings representing like parts.

This invention has for its objectto construct a blade-sharpenerespecially designed for sharpening trimmer-blades for sewing-machines.

In accordance with this invention an oilstone or equivalent abradingsurface is mounted in a suitable frame, and means are employed toreciprocate it longitudinally. A suitable support is provided in which abladeholder is arranged, to which the blade may be adj ustably secured,said support and holder being constructed and arranged to support theblade which is to be sharpened above and parallel with the oil-stone.The blade-holder is preferably pivotally connected to its support, sothat it may be turned on its pivot and the blade carried by it therebymoved into and out of contact with the oil-stone.

Figure l shows in side elevation a blade- Sharpener embodying thisinvention; Fig. 2, a plan view of the blade-sharpener shown in Fig. l;Fig. 3,a cross-sectional detail to be referred to.

The main frame-work a is of suit-able construction to support theoperating parts.

Two parallel bars b are secured to the frame-work, having a suitablespace between them to serve as a guidewayfor a guide-frame c. (Seedotted lines, Fig. l.)

The oil-stone d is secured to the guide-frame c. The guide-frame c isconnected by a connecting rod or pitman c with a crank-wheel c2, securedto a shaft c3, having its bearings in the frame-work, and to said shaftc3 a suitable belt-pulley is secured, by which it may be rotated. I havealso secured to the shaft c3 an emery-wheel c4, which may be used whendesired. As the crank-Wheel c2 is rotated, the oil-stone dwill bereciprocated longitudinally.

A post e is erected on the base of the framework, to which an arm e isattached, which constitutes a support for the blade-holder.

The blade-holder comprises a hub e2, mounted loosely on said armc,having a projection e3, provided on its upper side with a pin 2, andalso provided with an internally-screw threaded hole which receives aset-screw 4. The hub e2 is held in place on the arm e by two collars 5and 6, one at each side of the hub, which collars are secured to the arme by set-screws in any usual manner. One of the collars-as G, forinstance, (see Fig. 8)- is recessed and contains a spring which spirallyencircles the arm c', one end of which spring is secured to the collar 6and the other end to the hub e2, the tendency of the spring being tonormallykeep the arm or projection e3 in elevated position.

The trim mer-blade which is to be sharpen ed and for which thisapparatus is especially designed is of well-known 1nake,and has a shankportion m, slotted at its rear end, as at m', and provided at itsopposite end with a cuttingedge 7 and a projection V8. This trimmerbladeis fastened to a blade-holder bythe setscrew 4,which passes through theslot m and enters the arm e3, and said trimmer-blade is prevented fromturning on its holder by the pin 2, which passes up through the slot m.

The trimmer-blade having been secured to the blade-holder in the mannerdescribed or otherwise, by pressing upon the set-screw 4f, asrepresented in Fig. l, the blade is depressed against the action of thelifting-spring until the cutting-edge 7 of the trimmer-blade comes incontact with the oil-stone,which latter is being reciprocatedlongitudinally, as described. By this means the trimmer blade may besharpened.

Instead of employingmy device for sharpening trimmer-blades, as hereinshown, I may employ it to sharpen other forms of blades.

The upper side of the projection e3 in practice is slightly tipped overlaterally from a true horizontal plane to correspond with the usualbevel of that part of the blade just at the rear of the cutting-edge, sothat the established bevel of the blade will always be maintained,notwithstanding it is gradually sharpened.

I claiml. In a blade-Sharpener, the oil-stone and means to reciprocateit longitudinally, com- IOO bined with a post provided with an arm e toform a support for the blade-holder, and the blade holder comprising ahub mounted loosely upon said arm, a projection e3 on said hub, providedwith a pin 2 and set-screw upon its upper side, and collars on each sideof said hub, secured to the arin e', substantially as described.

2. In a blade-Sharpener, the oil-stone and means to reciprocate itlongitudinally, combined with a post and its arm e to form ablade-holder support, and the bladezholder comprising a hub mountedloosely upon said arm, a projection e3 on said hub, provided with a pin2 and set-screw on its upper side to hold the blade, and collars 5 6 oneach side VVof said hub, secured to the arm e', one of said WILLIAM H.REYNOLDS. Witnesses:

GEO. W. GREGORYQ ANNIE S. WIEGAND.

